Minor dental repairs can be done immediately the Same Day pending the condition of the dentures and what is to be done. It is always good practice to make regular visits to the dentist for maintenance and any fitting adjustment. It is also a good habit to do proper home care of dentures. Do not attempt to repair the denture with any do it yourself kit. This always makes things worse, difficult and more time consuming for the dentist. Save all broken pieces and see the dentist.